Hemming machine



- citizen vof the United States, residing at 500 York city, 'inL lPatented Mar. 30, 1926.

DAvIn w. KLAU, orQNEwYoRK,

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ottica-f j HEMMNGMACHINE 'Application filed February 26, 1925. Serial No..11,63 6.

To all whom t may conce/m: Y A j Be it known that. I, DAVID XV. KLAU, a'

lV est End Avenue, New the county and State of 'New York, have invented new and useful Improvements in Hemming Machines,`of isaspecification.

The general objectvof` thew invention isy greatly vto reduce thetiine', labor and handling required for sewi ng,he1nming or bindingthelongitudinal edges vof 'long pieces or Y material, such as material for roller shades.

It is very desirable toreduce' the va'moui'it of handling of 'material of this character, which ieretofo're has had to be run throughl the Asewing machine, taken back, and run through again. By the present inventionthelength Y "of material is hemmedon bothv edges vvat. a

. slottedY .table single pass, by causing it to travel overv a between two4 transversely spaced, relatively adjustable vsewing machines adaptedand drivenin unison to o perate simultaneously and equally on the two longitudinal folded edges. A particular Vobject of the invention is to vprovide a simple and efficient organization of thisy character, wherein it is possible not 'only readily to adjust the spacing between the machines, but also to adjust instantly the operation of the machines, one relatively to the' other, as for instance when a needle` breaks, so that the machines will be in unison.

In the accompanying drawings forming part hereof: f

Fig. 1 is a front elevation of a machine embodying the invention, a portion of the table being broken away to reveal parts in the slot, said parts being sectioned;

Fig. 2 is a plan view; Y Fig. 3 is a vertical section on an enlarged scale, taken on the line 3-3 of Fig. 1; and

F i0'. ff is a plan view illustrating the oper?,`

ation of the machine.

' transverse beams 4, as seen in Fig. 3, and on i opposite sides of thev slot suitable rabbeted guides 5 are provided. c

TWO reversely arranged sewing machines which the following if l *ing betweenthesewln'g'machines.-' Such ad- 6, their heads opposed lto eachctlienvare spaced apart'transversely of the table at the 'j region of the slot and guides,`the bases -7 of the frames of these machines l being mounted on the guides, soA that preferably Vbothfof the machines can be adjusted to-' ward'andfrom a center to change the'spacjustmentisA effected by sli'dingthe machines along thejguides lover the slot, past graduations 8 placed along 'thefedges of the? slot. The selected spacingv may be fiXed'by clamp Y i Landa-'shaft l'fconstitute' a formroftransverse shafting moun'tedfbeneath vthefftable top, in bearings 15,16 andl. The two parts'` of the shafting, disposed one on either'V hand, as geared togetherfby meshing gearsl 18 on their inner ends','rotatel1n oppositediwith upsl

vrections, and they drive the two machines I through sprocket chains19, 19 trained over upper and'lower sprocket "wheels :2O and 21,' on the operating shafts of the machines and` ing connections passing through the slot 3;. Whereas the pulley'12 may be a friction pul- Asa on the shafts 13, 14, respectively, the drive' ley to take an ordinary belt as is customary in sewing machines, it is important that all.4

parts of the driving mechanism between the common power source or intake and between the two machines be interconnected positivoly by meshing -Ymembers causing the two machines tooperate equally.

The sprocket wheels 21 are slidable lengthwise on the shafts 13 and 14, remaining in driven connection therewith Yby virtue of j key-ways 22 inthe shafts engaged by pinsv y23 in grooved hubs-24 of the wheels. The

grooved hubs are engaged by shifter forksy l 25, which are bolted to the bases 7 of the'` sewing machines and project downward through the slot 3, so that when the machines are relatively adjusted to change the spac-V Aing between them, the driving connections are likewise automatically shifted along the transverse` shafti'ng.

Fig.- 4' illustrates how the opposed sewing machines operate simultaneously on the opyposite folded edges of a'length of 'shadey material a. VThe material is being fedinl rthe hems. The necessity of absolutely equal' which are being` made at the saine'tiine in speed and operation as between the twosides Y` will be evident.

VThe split shattingv 13, lat haviiigiits ltwo parts geared to rotateE oppositely has the,A

special advantage that it permits the use of 'standard rsewingmachines,v the two Vn`iathe machines lthe feedj niust bje reversed,v so.

that when placed as shownboth will feed inthe Y*saine direction. Silnpler'-v shafting mightbeemployed but with less advantage.`l One. of the advantagesof connecting-themachines@with!v the, split slaaf-ting by, 'sprocket chains resides'. inthe aetthat the ymachines` K n comprising a1 table having a transverse slot are free to blevtiltedendwise. onfvthei tables toward the;vr inac-hines.. v chains to beslackened,sulieientl-ye,to, be

' shiftedione or more teeth relatively to: the sprocket:wheels for restoring unison between *the machines -at any time.-

A more limitedl relative adj ustability. ee-- tween the sewingl i machines Y would be. `had iik gone only x of ,the machines were made mova-A ble, butI it isg manifestlye deslrablethat bot-h be adjustable .farther apart or-nearer. to-

gether, )at opposite sides of thel centerA of the widtlrof the table.'l

K The part ofthefslotj-S between thema- Vshines, where thef materiali passes;e is Closed, bya movablejleover.' VThiscover`-` 1s best Clhines being Vduplicates enfeptjgthah irl-,one of# This',` .enablesA1 the y made ofa plate. or plates 26,2@ oi the saine widthasfthe bases 7 of the sewingy machines and of such thickness as to be flush with the niaehines, as byineans .off apertured lugs 27 45 projecting endwise from ,said z ibase, and pins Q8 projecting downward from theplate 26V to 1 enter'. thesedugs. Siin-ilarlugsf.- and pins 27=,- 28av conneet the plates ['26 and 26a, and so Yon',` ifftlrerehbewother plates.L

Whatisolainied'as'new-is;- s A1 machine ofethe 'Charaster;v described,

and bordering guidesgtwogopposed sewing machines mounted on j" said; table; relatie-ely '5'5 vshiftablealong'saldrgrndes, transverse duw ing means beneath the tableiconiprising two parts rotating on parallel axes, meshing: gears on the saidpartseausing:them torortate` inopposite direetons,` means Jfor driving U0 one l oi'- the parts andpsir'nilar positive :dri ving connections .c0mpr1s1ngsprolet; chains between the respective;sewingmaohines auchj`v theY respeetivewparts below the table, said swing machines-,being tiltableendwise-fto- 5 ward said sprocket chains.

The @over plates areV v 

